Punching-machine.



A. FRBIER. PUNGHING 111101111111.- IIIIIIIIIIIIIIIIIIIIIIIIII 0.

Patented June 27, 1911.

4 sums-$111121 1.

A. FREIER.

PUNGHING MAGHINE APPLICATION FILED 1330.13, 1910.

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Specification of Letters Patent.

Patented June 27, 1911.

Application filed December 13, 1910. Serial No. 597,023.

To all whom it may concern:

Be it known that I, ANTON FREIER, a citizen of the United States, and a resident of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Improvement in Punching-Machines, of which the following is a specification.

The present invention relates to machines especially adapted for punching external or internal slots in armature disks for electric motors of generators, and its object is to improve the construction thereof in the manner hereinafter set forth.

One embodiment of my improved punching machine is shown in the drawings which accompany and form a part of this specification, in which Figure 1 is a side elevation of the machine as seen from the pulley side, Fig. 2 is a side elevation of said machine as seen from the opposite side, Fig. 3 is a front elevation, Fig. 4 is a plan View of the indexing mechanism, Fig. 5 is a front view of the said mechanism, and Fig. 6 is a section taken on the line 66 of Fig. 4:.

In the particular drawings selected for illustrating my improvements, 1 represents a frame of any convenient form in which the drive-shaft 2 is suitably j ournaled. The combined pulley and fly-wheel 3 is loosely mounted on the drive-shaft and is arranged to be brought into operative engagement therewith by means of a clutch of any suitable type operated by the hand-lever 4 or else by the treadle 4 pivoted to the frame and connected with said lever by the rod 1'. In the present instance I have shown a well known clutch consisting of the rollers 11, cages 12, and the cam member 10. When the lever t, which is normally held up by the spring 5 is pulled downwardly, the link 6 connecting said lever and the arm 7, pulls the finger 9, rotatably mounted on the stud S and preferably integral with said arm, away from the stop member 14, and the latter by means of a spring (not shown) moves slightly about the shaft 2 in a counterclockwise direction, thereby causing the cages to force the rollers against the cams and thus move them outwardly into cooperation with the friction surface 13, integral with the pulley, so that the shaft and pulley are tightly clutched. It will be understood however that any other suitable clutch may be employed in place of the we l known type shown in the drawing. A relatively large driving gear 15, secured to the end of the shaft 2 opposite the pulley end, meshes with the relatively small pinion 16 which is se cured to the punch-operating shaft 17, and the latter, which is suitably journaled in the frame, carries the brake-disk 21 at one end and the slotted disk 27 at the other end. The punch 18 is connected by the rod 19 to the cross-head 20 on the shaft 17 in the usual manner. A brake-shoe 22, arranged to cooperate with the brake-disk 21, is adjustably secured by the rod 23 to the slide 24, and the latter, which is arranged to travel in the guide 24, is connected by the link 25 with the arm 26, the latter being integral with or else rigidly connected to the sleeve 8 to which the arm 7 is connected, so that upon the operation of the lever 4 the brake-shoe is withdrawn from the brake-disk at the same time that the pulley is clutched to the driveshaft. 1

In high speed punching machines, it is quite important and probably essential that the clutch or other similar means employed for quickly starting the machine be arranged in connection with the low speed driving shaft and that the braking device be arranged in connection with the high speed punch-operating shaft, and such arrangement, as heretofore described, constitutes one of the salient features of my invention, by which I am enabled to secure a very high speed of operation.

In machines of this character in which the inner or outer peripheries of disks are punched at regular intervals, an indexing device is necessary as is well unclertood. Heretofore, so far as I am aware, the ratchet member of such indexing mechanism has been operated by a reciprocating pawl. A machine having an indexing mechanism of this character is necessarily limited in speed because, among other things, the pawl will slide over, and sometimes miss a tooth, and eventually will dent or otherwise distort the shape of the same.

In the present invention I employ a stationary pawl and a ratchet wheel rotated step by step with respect to the same by means of a friction ring, and it has been found after a long period of use, that the ratchet wheel of a machine having the un usually high punching-speed of six hundred per minute, is very little the worse for wear.

As shown more particularly in Figs. 4, 5. and 6, my improved indexing mechanism consists of the ratchet wheel 38 secured in any suitable manner, as by the screws 40, to the disk 40 which is provided with the studs 41 and 41. The disk-holder 39 is preferably removably secured to said disk and ratchet wheel, and in the present instance I have shown all three connected together by said screws 40. The stud 41 may be provided with the key 41", which cooperates with suitably placed slots in the ratchet-wheel and disk-holder. To impart the necessary step by step motion to the indexing mechanism I prefer to employ the split ring 36, to the inner face of which a ring of suitable friction material 37, such, for example, as fiber, is fastened, and arranged to be adjustably secured to the disk 40 by the screw 35. The split ring terminates in an arm 35 whereby oscillatory motion may be imparted thereto in any suitable manner. In the present instance I have shown a rod 33 pivoted to said arm at 34 and. to the lever 31, one end of which is pivoted to the frame at 32 and the other end connected by the rod 30 to an adjustable pin 29 in the slot 28- of the disk 27. The pawl 49 is pivoted to the shoe 43 and its outer end maintained in contact with the ratchet by the spring 50. The shoe which carries the die-plate 48, preferably is removably secured to the bed-plate 45 by the bolts 46, which pass through the slots 47 in the shoe and the lugs 47 in the bed-plate, although it will be understood that such shoe may be adjustably secured tothe machine in any suitably manner. The shoe is provided with a split forwardly-extending projection 42 which affords a bearing for the stud'41 of the indexing mechanism and the bolt 44 may be provided foradjusting the friction thereof. It will be understood however that I do not limit myself to the particular means shown for mounting the indexing device or to the means hereinbefore described which cooperate therewith, inasmuch as the same is capable of general application.

The operation is as follows: A disk, a portion of which is shown in dotted lines at 51, is placed on the disk-holder 39 and secured thereon in any suitable manner,,as for example, by adjusting the same so that a hole therein fits over the pin 59. The operating lever: or treadle is then depressed thereby starting the machine. The several elements are so arranged that the punch begins its descent when the'lever 31 is in its extreme rearward position. As the punch descends, the lever 31 and connecting rod 33 move forward, but. the ratchet and index mechanism to which thedisk is securedare maintained stationary because the pawl is held in engagement with one of the teeth of the uppermost position and the lever 31 its rearmost posit-ion, one of the teeth of the ratchet wheel has moved past the pawl and the latter snaps into the space between said tooth and the one next adjoining, so that a new portion of the disk is presented to the punch. It will be noted that a tooth passes from under the pawl immediately before the lever 31 has finished its backward travel and that said lever must come to a full stop prior to moving forward again, so that when the lever starts to move forward and said pawl is holding the ratchet and diskholder in position, the latter is moving at its slowest speed, thereby reducing the wear on the teeth to a minimum. It is this action, which is diametrically opposite to that in which a reciprocating pawl is employed as above referred to, that enables the machine to operate at the high speed above specified. As soon as the punching-of a blank has been completed, the operator releases the pressure on the treadle whereupon the spring 5 causes the latter to rise, thestop 50 limiting its movement, and the finger 9 is brought into the path of the stop member 14, thereby releasing the clutch, while at the same time the high speed shaft is in stantly stopped by the brake 22.

While for the purpose of more fully ex plaining the principle of my invention I have described with some particularity a certain embodiment thereof, nevertheless it will be understood that many modifications Vmay be made therein by those skilled in-the art without departing from such principle.

I claim:

1. In a punching machine, a relatively low speed drive-shaft, apulley loosely mounted thereon, a relatively high speed punch-operating shaft, a clutch interposed between said pulley and drive-shaft, a-brake normally in contact with said punch-operating shaft, and hand-operated means for simultaneously releasing said brake and actuating said clutch.

2. In a punching machine, an indexing mechanism comprising a fixed pawl, a rotatably mounted ratchet wheel cooperating therewith, and friction means for imparting step by step rotation-to said ratchet wheel.

3. In a punching machine, an indexing mechanism comprising a fixed pawl, a rotatably' mounted ratchet wheel cooperating therewith, a disk secured to said ratchet wheel, a ring surrounding said disk, a friction surface fastened to the inner face of said ring and interposed between the same and said disk, and means for imparting oscillatory motion to said ring.

4:. In a punching machine, an indexing mechanism comprising a fixed pawl, a rotatably mounted ratchet wheel cooperating therewith, a disk-holder removably secured to said ratchet wheel, and friction means for imparting step by step rotation to said ratchet wheel.

5. In a punching machine, an indexing mechanism comprising a fixed pawl, a rotatably mounted ratchet wheel cooperating therewith, and means comprising a friction surface for imparting step by step rotation to said ratchet wheel.

6. In a punching machine, a punch-operating shaft, an indexing mechanism comprising a fixed pawl, a rotatably mounted ratchet wheel cooperating therewith, a member in frictional engagement with said ratchet wheel and connection between said punch-operating shaft and member for imparting step-by-step rotation to said ratchet wheel.

7 In a punching machine, an indexing mechanism comprising a fixed pawl, a rotatably mounted ratchet wheel cooperating therewith, a disk secured to said ratchet wheel, a ring in frictional engagement with said disk, and means for imparting oscillatory motion to said ring.

8. In a punching machine, an indexing mechanism comprising a fixed pawl, a rotatably mounted ratchet wheel cooperating therewith, a disk secured to said ratchet wheel, a ring surrounding said disk and provided with a lining of frictional material in engagement therewith, and means for imparting oscillatory motion to said ring.

9. In a punching machine, an indexing mechanism comprising a work-holder friction means for imparting step-by-step forward rotation to said work-holder and means for preventing retrograde rotation of said Work-holder.

10. In a punching machine, an indexing mechanism comprising a fixed pawl, a rotat-ably mounted ratchet wheel cooperating therewith, and means comprising a friction surface for imparting step-by-step rotation K to said ratchet wheel.

In testimony whereof, I have hereunto subscribed my name this 12th day of December, 1910.

ANTON FREIER. Witnesses:

E. B. TOMLINSON,

GEO. K. WOODWORTH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of latents,

Washington, D. G. 

